Script

jQuery(function(){
        $('p','#demo').remove();    
        $('#demo').append('<ul/>');
        $.each(jsonData,function(i,items){
            $("<li/>",{
                text:'名前：'+items.name+'　年齢：'+items.age+'　スキル：'+items.skills.join(',')
            }).appendTo('ul','#demo');
            if ( i == 4 ) return false;
        });
});

JSON

var jsonData = [
        {
            "name": "技評太郎",
            "age" : 26,
            "skills":["PHP" , "JavaScript"]
        },
        {
            "name": "長谷川広武",
            "age":25,
            "skills":["HTML" , "CSS"]
        },
        {
            "name": "徳田和規",
            "age":26,
            "skills":["JavaScript" , "jQuery"]
        }
    ]

HTML

//head内
<script type="text/javascript" src="js/sample02.json"></script>

//body内
<div id="demo">
<h4>リスト</h4>
<p><img src="images/loading.gif" width="32" height="32" alt="" /></p>
</div>

Demo